Zeromq patterns

1. What are the three messaging models provided by ZeroMQ messaging library?
2. Is ZeroMQ persistent?
3. How does ZeroMQ pub/sub work?
4. Does ZeroMQ use shared memory?
5. Does ZeroMQ use sockets?
6. Why ZeroMQ is fast?
7. Does ZeroMQ support MQTT?
8. Why Kafka is better than RabbitMQ?
9. What is Zmq Python?
10. Can subscriber send Zmq?
11. Is Zmq slow?
12. Does ZeroMQ guarantee delivery?
13. What is Zmq IPC?
14. What is Zmq context?
15. What is Inproc ZeroMQ?

What are the three messaging models provided by ZeroMQ messaging library?

ZeroMQ supports common messaging patterns (pub/sub, request/reply, client/server and others) over a variety of transports (TCP, in-process, inter-process, multicast, WebSocket and more), making inter-process messaging as simple as inter-thread messaging.

Is ZeroMQ persistent?

As far as I know, Zeromq does not have any persistence. It is out of scope for it and needs to be handled by the end user. Just like serializing the message.

How does ZeroMQ pub/sub work?

With pub-sub, it's how the pattern can map cleanly to the PGM multicast protocol, which is handled by the network switch. In other words, subscribers don't connect to the publisher at all, they connect to a multicast group on the switch, to which the publisher sends its messages.

Does ZeroMQ use shared memory?

ZeroMQ has inproc which uses shared memory as a byte transport. Boost. Interprocess seems to be mostly about having objects constructed in shared memory, accessible to multiple processes / threads.

Does ZeroMQ use sockets?

Sockets are the de facto standard API for network programming. That's why ZeroMQ presents a familiar socket-based API. One thing that make ZeroMQ especially tasty to developers is that it uses different socket types to implement any arbitrary messaging pattern.

Why ZeroMQ is fast?

ZeroMQ provides several transport protocols: inproc, IPC, TCP, TIPC and multicast. For connecting two processes in the same server it is considered that IPC is the fastest option, thanks to the usage of Unix Domain Sockets, thus achieving very low latency.

Does ZeroMQ support MQTT?

ZeroMQ is a flexible toolkit for writing different communications patterns, whereas MQTT is broker-based publisher/subscriber system. Although 0MQ has pub/sub sockets as one of it's many patterns, the wire format is different than that used by MQTT, so they are certainly not directly compatible.

Why Kafka is better than RabbitMQ?

Kafka is ideal for big data use cases that require the best throughput, while RabbitMQ is ideal for low latency message delivery, guarantees on a per-message basis, and complex routing.

What is Zmq Python?

ZeroMQ is a library that allows you to perform low-level message passing, but unlike message-oriented middleware, an ØMQ system can run without a dedicated message broker. To understand ØMQ, you need to think in the sense of network sockets that carry atomic messages across various transports.

Can subscriber send Zmq?

SUB can connect to multiple ZMQ. PUB (publishers). No single publisher overwhelms the subscriber.

Is Zmq slow?

Maybe ZeroMQ is just slow for this communication pattern and it excels in many-to-many communication patterns... Note: I "warmed" both middlewares before recording the results. Nevertheless ZeroMQ is always slower than Ice.

Does ZeroMQ guarantee delivery?

ZeroMQ guarantees to deliver all the parts (one or more) for a message, or none of them. This allows you to send or receive a list of frames as a single on-the-wire message. A message (single or multipart) must fit in memory.

What is Zmq IPC?

ZMQ is an IPC mechanism. There are other lower level mechanisms such as PIPEs and UDP sockets. I have worked with both PIPEs and UDP sockets and found that a higher level protocol such as ZMQ is almost always better even in a simple two party case, because of two problems with PIPEs and UDP: Buffering and chunking.

What is Zmq context?

Contexts help manage any sockets that are created as well as the number of threads ZeroMQ uses behind the scenes. Create one when you initialize a process and destroy it as the process is terminated. Contexts can be shared between threads and, in fact, are the only ZeroMQ objects that can safely do this.

What is Inproc ZeroMQ?

Synopsis. The in-process transport passes messages via memory directly between threads sharing a single ØMQ context. No I/O threads are involved in passing messages using the inproc transport. Therefore, if you are using a ØMQ context for in-process messaging only you can initialise the context with zero I/O threads.